In order to perform efficient image analysis for cancer tests that use nematodes, this cancer analysis system Z is characterized by having: a light source unit that irradiates, from below, a plate on which nematodes and a urine sample have been plotted; an imaging device (2) that captures images of the plate as irradiated by the light source unit; and an analysis device (1) that analyzes images captured by the imaging device (2). After combining the pixels of the images with larger pixels, the analysis device (1) performs migration analysis on the nematodes on the basis of temporal changes in information on the luminance centroid of the images.